Improvement in air-engines or fan-blowers



aan sara aan effet Letters raient Np. 110,915, naar January 1o, 1871.

1 i '.IMPRVEME'N'T IN AIR-ENGINES 0R FAN-BLowsRs.

The Schedule referred toin these Letters Patent and making part of the same.

To all to whom thesepresentssmll come Be it known that I, GARDNER C. Hammers, of Boston, in the county of Suiiolk and YState of Massachusetts, have made au invention of certain Improve- `ments in the Construction of Air-Engines or Fan- Blowers, so called; and do hereby declare the following to be a full, clear, and exact description thereof, due reference being had to the accompanying drawing making part of this specification, and in which- Figures 1 and 2` are opposite vertical sections of a fblowcr containing my improvements;

Figure 3 being an elevation of its skeleton-wheel, as removed from the outer case or shell.

The principal object I have had' in view in originating the invention herein described `has been, after consulting extreme economy in. cost, to obviate the injurious jar and consequent wear oti the vengine rep sulting i'rointhc vibration of the radial arms which compose the part of the wheel that supports and gives motion to the air-forcing blades, as well as to abolish 'the annoying sounds nowresulting from such vibration, and toV greatly strengthen the various parts composing thc said wheel.

The invention consists in the introduction between each arm of the wheel and the blade or fan attached to it, of asheet or block of India rubber or other suitable elastic material, which shall serveto receive and vitiate, to a considerable extent, the vibration which the iiight ofthefan through the air would otherwise impart to the arm and other part ofthe engine.

'lhe drawing accompanying this specification, and wherein. my present invention is illustrated, represents, at

' A, the upright case of an air-engine of the snailshcll form, so called, the horizontal wheel-supporting shaft of the engine being represented, at '13,as supportcdin suitable bearings or boxes, au, making part of or aflixedin a'propcr manner to the opposite sides of the case A, a radial-armed wheel, G, being mounted upon such shaft, this arrangement of case, shalt, and wheel and bearings being the same as now vin general use, and constituting, in themselves, no part of my invention. y, .i

In carrying out this invention, I unite the entiry series ot' radial arms, b b, &c.', of the wheel C, by an annular brace or ring, D, situated somewhat near their outer ends, such ring being concentric with the axis of the wheelin order, as before observerhto otfer, practically, little it` any resistance to the passage of the wheel through the air, and yet serve to greatly strengthen and mutually'support the arms, as Well as to vitiate or lessen vibration of thesame.

To complete the action ofthe annular brace D, or,

in itself, to abolish4 the sound or hum imparted to" the wheel by the passage of the same through'the air, I intelpose between each fan onvane, 'c c, 85o., of

the wheel, and the arm or. spoke to which such fan is attached, a sheet or block, d, of India rubber 0r other` elastic substance or material, which receives and dissipates .the vibration' which'would otherwise be imparted by the fan to the arm and other parts of the engine. i v A Y 4"lhe above-described construction of wheelvenables me to produce an effective air-engine at very little comparative cost-,'and, while removing the annoying sound now common to'such engines, greatly prolongs its term of service, as compared with those nowrmanufactured; Y

Although the accompanying drawing represents but one series of blade-supporting arms, two or more may,

be adopted at pleasure.

` Claim.

I claimi 4 The interposition, between the armor spoke of the wheel of an air-engine and the fan or'blade carried thereby, of an elastic medium, for purposes stated. GARDNER 0. HAWKINS.

. Witnesses:

FRED.' CURTIS,A EDW. (flnnnrrrr.n 

